1、算法

r = Math.sqrt((r- rightr)^2 + (r-bottomr)^2)*2

g = Math.sqrt((g- rightg)^2 + (g-bottomg)^2)*2

b = Math.sqrt((b- rightb)^2 + (b-bottomb)^2)*2

2、代码实现

public Bitmap render(Bitmap bitmap)  {    if(bitmap == null)return null;    int width = bitmap.getWidth();    int height = bitmap.getHeight();    int[] pixels = new int[width * height];    bitmap.getPixels(pixels ,0 , width , 0 , 0 , width , height);    int rectTop = 0;    int rectBottom = height-1;    int rectLeft = 0;    int rectRight = width-1;    for(int i=rectTop ; i
     
      >16;        int g = (pixel & 0x0000ff00)>>8;        int b = (pixel & 0x000000ff);        int leftR = (leftPixel & 0x00ff0000)>>16;        int leftG = (leftPixel & 0x0000ff00)>>8;        int leftB = (leftPixel & 0x000000ff);        int bottomR = (bottomPixel & 0x00ff0000)>>16;        int bottomG = (bottomPixel & 0x0000ff00)>>8;        int bottomB = (bottomPixel & 0x000000ff);        r = algorithm(r , leftR , bottomR);        g = algorithm(g , leftG , bottomG);        b = algorithm(b , leftB , bottomB);        pixels[i*width +j] = (pixel & 0xff000000) + (r<<16)+ (g<<8) +b;      }    }    return Bitmap.createBitmap(pixels ,width , height , Config.ARGB_8888);  }                                    public int algorithm(int value , int leftValue , int bottomValue){  int pixel = (int)(Math.pow(value-bottomValue , 2) + Math.pow(value-leftValue , 2) ) ;  pixel = (int)(Math.sqrt(pixel) * 2);  if(pixel<0)  {    pixel = 0;  }  if(pixel>255)  {    pixel = 255;  }  return pixel;}